<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>整数替换</title>
</head>
<body>
  <script>
    function fn(n) {
      if (n == 1) {
        return 0;
      }
      if (n % 2 == 0) {
        return 1 + fn(Math.floor(n / 2));
      }
      return 2 + Math.min(fn(Math.floor(n / 2)), fn(Math.floor(n / 2) + 1));
    }
    console.log(fn(7))
  </script>
</body>
</html>